Insufficient Engine Temperature; Low Engine Oil Pressure; Battery Will Not Recharge; Joystick - Mercury MerCruiser Owner's Manual

Section 7 - Troubleshooting
Seawater pickups or sea strainer obstructed.
Faulty thermostat.
Coolant level (if equipped) low in closed cooling
section.
Heat Exchanger or Fluid Cooler plugged with foreign
material
Loss of pressure in closed cooling section.
Faulty seawater pickup pump.
Seawater discharge restricted or plugged.

Insufficient Engine Temperature

Faulty thermostat.

Low Engine Oil Pressure

Insufficient oil in crankcase.
Excessive oil in crankcase (causing it to become
aerated).
Diluted or improper viscosity oil.

Battery Will Not Recharge

Excessive current draw from battery.
Alternator drive belt loose or in poor condition.
Unacceptable battery condition.
Loose or dirty electrical connections or damaged
wiring.
Faulty alternator

Joystick

The joystick does not control the boat.
Response to joystick input is erratic, or the joystick
operates independent of input.
The joystick does not function properly and a fault
code is set.
The joystick does not work; No fault code is set and
cruise control engaged.
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Possible Cause
Possible Cause
Possible Cause
Possible Cause
Symptom
Remedy
Remove obstruction.
Replace.
Check for cause of low coolant level and repair. Fill
system with proper coolant solution.
Clean Heat Exchanger, Engine Oil Cooler, and
Transmission Oil Cooler (if equipped).
Check for leaks. Clean, inspect and test pressure cap.
Repair.
Clean exhaust elbows.
Replace.
Remedy
Check and add oil.
Check and remove required amount of oil. Check for
cause of excessive oil (improper filling).
Change oil and oil filter, using correct grade and
viscosity oil. Determine cause for dilution (excessive
idling).
Remedy
Turn off non‑essential accessories.
Replace and/or adjust.
Test battery, replace if necessary.
Check all associated electrical connections and wires
(especially battery cables). Clean and tighten faulty
connections. Repair or replace damaged wiring.
Test alternator output, replace if necessary.
Remedy
One or both remote controls are not in neutral. Put
both remote controls in neutral.
One or both engines are not running. Start the engine
or engines.
Ensure there are no radios or other sources of
electronic or magnetic interference near the joystick.
Check VesselView for Guardian fault codes that
indicate reduced engine power. If found, have the
system checked by your authorized Mercury
MerCruiser dealer.
Disengage cruise control.
90-899883295 JUNE 2008
Remedy